1 Jacob was a curious child. He liked to ask questions. Today was no different. He was visiting his pediatrician, or child's doctor, for his check-up.2 During the exam, the doctor looked at Jacob's eyes, ears, and throat. He measured how tall he was and how much he weighed to see how much he had grown. Jacob understood why the doctor checked all of these things. What he didn't understand was why the doctor had to put that cold thing called a stethoscope on his chest.3 Not being a child who was afraid of learning something new, Jacob spoke up. "What are you doing, Dr. Sesner?" Jacob asked his doctor.4 "I am using my stethoscope," Dr. Sesner answered.